1.

Fe^(+3) ions in an aqueous solution gives deep red colouration with both sodium acetate (in excess) and ammonium thiocyanate(slightly acidic). The deep red colouration obtained with ammonium thiocyanate gets decolourised on addition of a solution containing F^(-) ions. The deep red colouration is due to the formation of:

Answer»

`Fe(CH_(3)COO)_(2)`
`Fe(OH)_(2)CH_(3)COO`
`[Fe_(3)(OH)_(2)CH_(3)COO)_(6)]^(+)`
`[Fe_(3)(CH_(3)COO)_(6)]`

Solution :`Fe(SCN)_(3) overset(F^(-))rarr [feF_(6)]^(3-)` COLOURLESS `(SP^(3)d^(2))`
`underset(("Red COLOURATION"))([Fe_(3)(OH)_(2)(CH_(3)COO)_(6)]^(+))+4H_(2)O rarr underset(("Red ppt"))(3Fe(OH)_(2)CH_(3)COOdarr)+3CH_(3)COOH +H^(+)`


Discussion

No Comment Found